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US 7,660,199 B2Granted
Microseismic event detection and location by continuous map migration
AssigneeSchlumberger Technology Corporation
InventorJulian Drew
Life of this patent
Estimating the term…
Abstract
The present invention provides methods and systems for microseismic hydraulic fracture monitoring in real-time. The methods and systems of the present invention may include continuous map migration of recorded microseismic signals. The methods and systems provide robust automated simultaneous detection and location of microseismic events.
Claims22
A method of detecting and locating a microseismic event, comprising:
- providing an estimate of space for a location of a source;
- providing an estimate of a velocity model for a formation;
- after providing the estimates, receiving data of a microseismic event with a first seismic sensor located on a tool in a wellbore;
- receiving data of the microseismic event with a second seismic sensor located on the tool;
- selecting an instant in time;
- selecting a plurality of locations in the estimated space, wherein the estimated space is not between the first and second sensors;
- utilizing the receiving data to determine a first break using forward modelled traveltimes;
- determining, with a processor, whether the data received by the first sensor and the data received by the second sensor coalesce at any of the selected locations at the instant;
- and
- determining, with a processor, the location of the source.
7 more elements
A method of detecting and locating a microseismic event, comprising:
- providing an estimate of space for a location of a source of the microseismic event, the estimate being at least partially based on a estimated relative location of a tool and the microseismic event;
- providing an estimate of a velocity model for a formation;
- receiving data of the microseismic event with a first and a second seismic sensor located on the tool in a wellbore, the data including at least a P-wave and an S-wave component;
- selecting at least a first and a second instant in time;
- utilizing the receiving data to determine a first break using forward modelled traveltimes;
- attempting, with a processor, to coalesce the signal received by the first and second sensors at the first instant in time at a plurality of locations in the space;
- attempting, with a processor, to coalesce the signal received by the first and second sensors at the second instant in time at a plurality of locations in the space;
- coalescing the signal received by the first and the second sensors;
- and
- determining the location of the source.
7 more elements
A method of detecting and locating a microseismic event, comprising:
- providing an estimate of space for a location of a source of the microseismic event;
- providing an estimate of a velocity model for a formation;
- after providing the estimates, receiving data of the microseismic event with a first and a second seismic sensor located on a tool in a wellbore;
- automatically selecting at least a first and a second instant in time;
- automatically utilizing the receiving data to determine a first break using forward modelled traveltimes;
- automatically attempting, with a processor, to coalesce the signal received by the first and the second sensors at the first instant in time at a plurality of locations in the space;
- automatically attempting, with a processor, to coalesce the signal received by the first and the second sensors at the second instant in time at the plurality of locations in the space;
- automatically coalescing the signal received by the first and the second sensors;
- and
- automatically determining the location of the source, wherein the location is not between the first and second sensors.
7 more elements
Dependencies are inferred from the claim text.